Tạp chí KHCNXD

Tạp chí Khoa học Công nghệ Xây dựng số 3/2016

Ngày tạo : 22/11/2016

Nghiên cứu thực nghiệm về biến dạng dài hạn của cột bê tông cốt thép chịu nén đúng tâm, download

ThS. Trần Ngọc Long, PGS. TS. Lý Trần Cường

Tính toán tối ưu thiết bị TMD giảm chấn cho hệ kết cấu có 01 bậc tự do, download

ThS. Nguyễn Xuân Đại, ThS. Vương Tuấn Hải, ThS. Nguyễn Văn Công

Kiến nghị về sử dụng phương pháp tính toán sức chịu tải của cọc lấy từ thiết kế theo ứng suất cho phép trong thiết kế theo trạng thái giới hạn, download

TS. Trịnh Việt Cường

Kiểm toán sự ổn định nền đắp theo tiêu chuẩn hiện hành bằng các phần mềm Geo – Slope, Plaxis, Geo 5, download

ThS. Trương Hồng Minh

Ứng dụng hệ sơn Polyurea để chống thấm khe biến dạng của đập bê tông sau khi tích nước, download

ThS. Nguyễn Đăng Khoa, TS. Phạm Văn Khoan, KS. Nguyễn Văn Tuấn

Tối ưu hóa các yếu tố công nghệ trong chế tạo vật liệu cốt composite polymer, download

ThS. Bùi Thị Thu Phương, PGS. TS. Nguyễn Võ Thông, TS. Nguyễn Thế Hùng

Nghiên cứu chế tạo vật liệu chống thấm từ polystyren tái chế, download

TS. Ngô Sỹ Huy, ThS.Lê Sỹ Chính, SV. Lê Văn Trường

So sánh quy định về chiều dài neo và nối chồng cốt thép của tiêu chuẩn TCVN 5574:2012 với một số tiêu chuẩn quốc tế, download

TS. Nguyễn Ngọc Bá, ThS. Đào Quang Trường

Tính toán và cấu tạo bản tròn bê tông cốt thép theo TCVN 5574:2012, download

ThS. Ngô Quang Hưng

Tính toán cột chịu nén lệch tâm xiên bằng phương pháp gần đúng, kết hợp với biểu đồ tương tác theo TCVN 5574:2012, download

ThS. Nguyễn Thị Ngọc Loan

ABSTRACT

Experimental research on long-term deformation of reinforced concrete columns under concentric axial load (pp.3-7)

MEng. TRAN NGOC LONG, A/Prof.Dr.LY TRAN CUONG

This paper presents experimantal research on long-term axial deformation of reinforced concrete colunm under concentric axial load. This  experimental has been conducted in Experiment Buildings Laboratory of National University of Civil Engineering (NUCE) from October, 2014 to April, 2016. It can be shown from the test results obtained after a period of time of 487 days that: (i) Long-term deformation occurs mainly in the first year of loading; (ii) Reinforcement ratio significantly affects the long-term deformation of the test specimens; (iii) The values of deformation due to creep are much larger than those due to shrinkage; and (iv) The total deformation due to creep and shrinkage is nearly 3 times larger than the instanneous deformation after 487days.The test results obtained are consistent and can be used for further related analyses.

Optimal design of systems Tuned_Mass Damper for single degree of freedom structural system (pp. 8-15)

MEng. NGUYEN XUAN DAI, MEng. VUONG TUAN HAI

The Tuned Mass Dampers is a classical damped passive systems, by relative displacement between TMD’s mass and mass of primary structure, TMD has the effect of dissipation of energy of vibration in the primary structures. An optimal design TMD in minimizing the displacement variance of single degree of freedom systems. In this paper the authors investigate and analyse the procedure for the design optimization of tuned mass damper through the dynamic magnification factor by the analytical and numerical  methods.

Propose on the use of calculate the load capacity of the pile from stress design allows to design according to limit state (pp. 16-22)

Dr. TRINH VIET CUONG

The experience from advanced countries showed that the change of the methods or formulas for calculating the pile bearing capacity from allowable stress codes to be applied in limit states codes is a complex problem. In some cases,  the equivalent factor of safety is an index for evaluating the suitabilty of the change. This paper presents some observation on the use of some methods of calculation of pile bearing capacity taken from of allowable stress design codes in current Vietnamese standard and proposes the formulas of calculating equivalent factor of safety.

Assessment for embankment stability according to current standard by using geo – slope, plaxis and Geo 5 softwares (pp.23-30)

MEng. TRUONG HONG MINH

The paper presents the results of stability analysis for the embankment with variation of shape, geometry, geology - engineering and surface load by using Geo Slope, Plaxis, Geo 5 softwares and the assessment of embankment stability according to current standard in Vietnam (22TCN 262-2000). The results of analysis and evaluation show that the analysis of embankment stability could be carried out by either one of the mentioned software that still ensure the safety of the structure; and the minimum stable coefficient equal to 1.4 that is specified in current standards for analysis method of A.W.Bishop is suitable for both stress - strain analysis method for Morh - Coulomb soil model in Plaxis.

Application of polyurea coating system for waterproofing of deformation joints of concrete dams after storing water (pp.31-36)

MEng. NGUYEN DANG KHOA, Dr. PHAM VAN KHOAN, Eng.  NGUYEN VAN TUAN

In recent years, many hydro power dams have been built  in Vietnam. Leakage of water has been detected after storing water, mainly through the deformation joints. To overcome this situation, an effective solution is waterproofing the upstream surface of deformation joints of dams. Because concrete was soaked in water for a long time, the concrete became wet. Therefore, the water-based primer should be selected to ensure a good adhesion between the polyurea coating system and concrete substrate. With the advantages of polyurea coating system, it was considered as the most effective solution to waterproof for the upstream surface of deformation joints.

This paper presents the research results of polyurea coating system application to waterproof the upstream surface of deformation joint for roller compacted concrete dams, i.e. the  Song Tranh No2 hydropower, the Ban Ve hydropower and the Ban Chat hydropower. The waterproofing was carried out after the lake was stored water.

Opitimization of technological factors in manufacturing glass fiber reinforced polymer (pp.37-43)

MEng. BUI THI THU PHUONG, A/Prof.Dr.NGUYEN VO THONG, Dr. NGUYEN THE HUNG

Glass fiber-reinforced polymer materials have a tensile stress 1.5-2 times higher than traditional steel while its weight is 5 times lighter, so it can be used for projects with special requirements. The purpose of this study is optimizing technological factors affecting to the process of manufactoring material and then, gradually mastering and mastering core technology of the completel production line system of Glass fiber-reinforced polymer in Vietnam.

The study of using recycled polystyrene to produce water impermeable material (pp.44-51)

Dr. NGO SY HUY, MEng. LE SY CHINH, Student. LE VAN TRUONG

This paper investigates the use of recycled polystyrene, a kind of industrial and domestic waste, to produce water impermeable material. Ingredients of this material include polystyrene, cement, sand, rice husk ash, and sodium silicate that are common materials in Vietnam. The production and construction process of this material are simple. Test results indicate that this material satisfies all requirements about tensile adhesion strength and water impermeability stipulated by Vietnam and European standards.

Comparision between the provisions on anchorage and lap length in TCVN 5574:2012 and in other international codes (pp.52-54)

Dr. NGUYEN NGOC BA, Eng. DAO QUANG TRUONG

This paper introduces basic formula for calculation of development length of reinforcement bar in concrete and compares the provisions on anchorage and lap length in popular reinforced concrete design codes and standards, including Vietnamese standard TCVN 5574:2012 and other codes SP 63.13330.2012, EN 1992-1:2004, BS 8110:1997, ACI 318-14. The result of comparison shows that the anchorage and lap lengths computed from TCVN 5574:2012 are significantly lower than computed from other standards. The authors recommend the anchorage and lap lengths be computed based on the Russian standard SP 63.13330.2012 when designing reinforced concrete structures using TCVN 5574:2012 and the lap length for compression reinforcement computed based on SP 63.13330.2012 when using TCVN 9386:2012 for seismic design.

Analysis  and detailing of the reinforced concrete circular slab following tcvn 5574:2012 (pp.55-60)

MEng. NGO QUANG HUNG

The reinforced concrete circular slab are usually used for civil and industrial structures such as silos and foundation slab of heavy structure with circular plan. This is a specific  type of slab used in civil and industrial constructions. However, the analysic and detailing of such kind are rarely mentioned in technical documents and standards.

This paper presents the analysic and detailing of the reinforced concrete circular slab, supported in perimeter under the uniform loading, following the standard TCVN 5574:2012.

Load capacity of reinforced concrete columns under compression combined with biaxial bending, using interaction curves according to TCVN 5574:2012 (pp.61-66)

MEng. NGUYEN THI NGOC LOAN

This paper presents the method to define the ultimate strength of reinforced concrete columns under axial compression combined with biaxial bending. The method was based on the two well-known methods, reciprocal load method and load contour method, which were introduced by B. Bresler, and interaction curves for rectangular sections established according to TCVN 5574:2012.

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